Gear tooth polishing device

Abstract

The utility model provides a gear tooth polishing device, and relates to the technical field of gear tooth polishing devices, the gear tooth polishing device comprises a polishing machine and a plurality of polishing heads, one side of the polishing machine is provided with a mechanical arm, one side of the polishing machine is provided with a rotating disc, one side of the rotating disc is fixedly connected with a clamp, and the clamp is provided with a plurality of polishing heads. A convenient-to-replace device is arranged between one side of the mechanical arm and the multiple polishing heads and comprises a hollow disc and a belt, one side of the hollow disc is fixedly connected with one side of the mechanical arm, through holes are symmetrically formed in the inner wall of the hollow disc, a support is fixedly connected to the outer surface of the hollow disc, and the belt is fixedly connected with the support. By arranging the device convenient to replace, a plurality of grinding heads can be installed on the same hollow disc at a time, then the grinding heads of the corresponding sizes and models can be replaced and selected for grinding according to the use requirement under the condition that the grinding heads do not need to be disassembled and then installed, and the gear tooth grinding machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear tooth polishing device technical field especially relates to a gear tooth polishing device. BACKGROUND

[0002] Gear tooth polishing device is a kind of equipment specially designed for polishing the surface of gear tooth, and its main function is to grind, polish gear tooth by abrasive or grinding tool, to remove burrs, rust marks, oxide layer and other defects on the surface of gear tooth, improve the precision, smoothness and service life of gear.

[0003] When using the polishing machine to polish the gear tooth, the gear is usually placed on the clamp on the polishing machine for limiting and fixing, then the corresponding polishing head is installed on the mechanical arm, the mechanical arm of the polishing machine is started to drive the polishing head to polish the place where the gear tooth needs to be polished, and the clamp and the clamped gear are rotated by starting the turntable of the polishing machine, and the mechanical arm and the polishing head are polished, since the polishing head used for different positions of gear tooth is different, the traditional polishing machine is disassembled after using the polishing head, then the polishing head to be used is installed, which leads to more operation steps and longer replacement time, and reduces the efficiency of gear tooth polishing. UTILITARIAN CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art and provides a gear tooth polishing device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a gear tooth polishing device, comprising a polishing machine and a plurality of polishing heads, one side of the polishing machine is provided with a mechanical arm, one side of the polishing machine is provided with a turntable, one side of the turntable is fixedly connected with a clamp, one side of the mechanical arm and a plurality of polishing heads are provided with a convenient replacement device, the convenient replacement device comprises a hollow disc and a belt, the convenient replacement device can install a plurality of polishing heads on the same hollow disc at a time, then the corresponding size model polishing head can be replaced and used for polishing without disassembling and reinstalling according to the use requirement, and the gear tooth polishing efficiency is improved.

[0006] The effect achieved by the above-mentioned components is that when the gear is placed on the clamp of the grinding machine for grinding processing, the different sizes of the grinding heads needed are installed on the hollow disc on one side of the mechanical arm, the mechanical arm of the grinding machine is started, and the corresponding grinding head is selected by the convenient replacement device to grind the gear teeth that need to be ground. At the same time, the clamp and the clamped gear are driven to rotate by the rotating disc of the grinding machine, and the grinding is carried out by the mechanical arm and the grinding head.

[0007] Preferably, one side of the hollow disc is fixedly connected with one side of the mechanical arm, the inner wall of the hollow disc is symmetrically provided with a through hole, the outer surface of the hollow disc is fixedly connected with a support, one side of the support is fixedly connected with a motor, the output end of the motor is fixedly connected with a circular shaft, one end of the circular shaft is connected with one side of the support in a penetrating manner, the inner wall of the hollow disc is rotatably connected with a gear ring block, the inner wall of the belt is respectively sleeved on the outer surfaces of the circular shaft and the gear ring block, the inner wall of the hollow disc is connected with a circular rod in a penetrating manner, the outer surface of the circular rod is fixedly connected with a plurality of abutting frames, the inner wall of the hollow disc is fixedly connected with a plurality of first telescopic rods, one end of the first telescopic rod is fixedly connected with an abutting block, the outer surface of the first telescopic rod is sleeved with a first spring, the two ends of the first spring are respectively fixedly connected with one side of the abutting block and one side of the inner wall of the hollow disc, one side of the abutting block is rotatably connected with a gear rod, one end of the gear rod is connected with one side of the inner wall of the hollow disc in a penetrating manner, and the outer surface of one end of the gear rod is engaged with the inner wall of the gear ring block.

[0008] The effect achieved by the above-mentioned components is that by setting the convenient replacement device, when the gear is placed on the clamp of the grinding machine for grinding processing, the grinding head needed is installed on the gear rod, and then according to the actual grinding condition of the gear teeth, the circular rod is manually rotated to drive the abutting frame to rotate in the inner wall of the hollow disc to a certain angle, the abutting frame abuts and extrudes the abutting block to move downward, the first telescopic rod and the first spring are pressed and contracted downward, the gear rod and the unused grinding head are driven to move downward to a certain position, the one end of the gear rod is dislocated from the gear ring block, and only the gear rod on one side of the grinding head needed is engaged with the gear ring block. When grinding, the motor on the support is started to drive the circular shaft to rotate, and then the gear ring block can be driven to rotate in the inner wall of the hollow disc under the transmission of the belt, so as to drive the gear rod and the grinding head needed to rotate, and the surface of the gear teeth is ground. Similarly, when the other two grinding heads are needed, the same operation is performed, which can reduce the replacement operation steps, reduce the replacement time, and improve the grinding efficiency of the gear teeth.

[0009] Preferably, one end of the round rod is provided with a limiting mechanism, the limiting mechanism comprises a threaded rod, one end of the round rod is fixedly connected with a threaded hole block, one side of the hollow disc is provided with a plurality of threaded grooves, one end of the threaded rod is spirally inserted into the inner wall of the threaded hole block and the inner wall of the threaded groove.

[0010] The effect achieved by the above component is that: by setting the limiting mechanism, after the abutting frame is extruded and pushed to adjust the abutting block by rotating the round rod, and after the corresponding grinding head is replaced, for the convenience of use, the bolt can be manually screwed into the inner wall of the threaded hole block and the corresponding threaded rod, and the round rod that has been rotated to a certain number of turns is limited and fixed, so that only one gear rod is engaged with the tooth ring block at this time, and only one grinding head can rotate to grind the gear teeth.

[0011] Preferably, one side of the abutting frame is fixedly connected with a plurality of ball bearings, and the plurality of ball bearings are arranged at equal distances.

[0012] The effect achieved by the above component is that: by setting the ball bearings, the contact and wear between one side of the abutting frame and one side of the ground block can be reduced, the abutting and pushing operation is facilitated, and the service life of the two is improved.

[0013] Preferably, one end of the round rod is fixedly connected with a bearing, and the outer ring of the bearing is fixedly connected with one side of the inner wall of the hollow disc.

[0014] The effect achieved by the above component is that: by setting the bearing, one end of the round rod can be limited on one side of the inner wall of the hollow disc, so that the rotation of the abutting frame is more stable and not easy to shake, and the rotating wear between the round rod and the hollow disc is reduced, and damage is avoided.

[0015] Preferably, a detachable device is arranged between the outer surface of one end of the gear rod and the grinding head, the detachable device comprises a groove block, one side of the groove block is fixedly connected with one side of the grinding head, a card hole is symmetrically arranged on the inner wall of one end of the groove block, one end of the gear rod is inserted into the inner wall of the groove block, a sliding groove is symmetrically arranged on the outer surface of one end of the gear rod, a second spring is fixedly connected with one side of the inner wall of the sliding groove, a clamping block is fixedly connected with one end of the second spring, the clamping block is slidably connected with the sliding groove, and one end of the clamping block is inserted into the inner wall of the card hole.

[0016] The effect achieved by the above component is that: by setting the detachable device, when the grinding head needs to be replaced, the clamping block can be manually held and slid inward in the inner wall of the sliding groove to a certain position, driving the second spring to contract, and then the other end is pulled out of the card hole, at this time, the groove block can be pulled upward and detached from the gear rod, which is convenient for replacing other size and model grinding heads, and improves the use adaptability of the convenient replacement device.

[0017] Preferably, the longitudinal section of the clamping block is in the shape of U, and the height of one end of the clamping block is higher than that of the other end.

[0018] The effect achieved by the above components is that by designing one end of the clamping block to be higher than the other end, the clamping block can be pressed conveniently when the groove block needs to be removed.

[0019] Preferably, the inner wall of the sliding groove is fixedly connected with a second telescopic rod, one end of the second telescopic rod is fixedly connected with one side of the clamping block, and the outer surface of the telescopic rod is connected with the inner wall of the second spring.

[0020] The effect achieved by the above components is that by setting the second telescopic rod, the inner wall of the second spring can be supported and reinforced, so that the second spring is not easy to be damaged during use, and the service life is improved.

[0021] Compared with the prior art, the advantages and positive effects of the utility model lie in that:

[0022] In the utility model, the device is convenient to replace, a plurality of polishing heads can be installed on the same hollow disc at one time, and the corresponding size and model of polishing head can be selected and used for polishing without disassembly and reinstallation according to the use requirement, so that the polishing and machining efficiency of gear teeth is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0024] Figure 2 It is a three-dimensional structure schematic view of the hollow disc in the utility model;

[0025] Figure 3 It is Figure 2 It is a partial three-dimensional structure schematic view of the gear rod in the utility model;

[0026] Figure 4 It is Figure 2 It is an enlarged three-dimensional structure schematic view of A in the utility model;

[0027] Figure 5 It is a three-dimensional structure schematic view of the motor in the utility model.

[0028] Legend: 1. Grinding machine; 2. Easy-to-change device; 3. Detachable device; 4. Robotic arm; 5. Grinding head; 6. Turntable; 7. Clamp; 21. Hollow disc; 22. Through hole; 23. Bracket; 24. Motor; 25. Round shaft; 26. Belt; 27. Gear ring block; 28. Round rod; 29. ​​Limiting mechanism; 291. Screw hole block; 292. Bolt; 293. Threaded groove; 210. Abutment frame; 211. First telescopic rod; 212. Abutment block; 213. Gear rod; 214. First spring; 215. Ball bearing; 216. Bearing; 31. Slide groove; 32. Second spring; 33. Locking block; 34. Groove block; 35. Locking hole; 36. Second telescopic rod. Detailed Implementation

[0029] Example 1, such as Figures 1-5 As shown, a gear tooth grinding device includes a grinding machine 1 and several grinding heads 5. A mechanical arm 4 is provided on one side of the grinding machine 1, and a turntable 6 is provided on one side of the grinding machine 1. A clamp 7 is fixedly connected to one side of the turntable 6. A replacement device 2 is provided between one side of the mechanical arm 4 and the several grinding heads 5. The replacement device 2 includes a hollow disc 21 and a belt 26. The replacement device 2 can install several grinding heads 5 on the same hollow disc 21 at one time, and then replace them with grinding heads of the corresponding size and model without disassembly and reinstallation as needed, thereby improving the efficiency of gear tooth grinding. When using a grinder 1 to grind the tooth pressure area of ​​a gear, the gear is usually placed on the clamp 7 on the grinder 1 for positioning and fixation. Then, several grinding heads 5 of different sizes are installed on the hollow disk 21 on one side of the robotic arm 4. The robotic arm 4 on the grinder 1 is started, and the appropriate grinding head 5 is selected with the help of the easy-to-change device 2 to grind the area of ​​the gear teeth that needs to be ground. At the same time, the turntable 6 on the grinder 1 is started to drive the clamp 7 and the clamped gear to rotate, and the grinding is carried out in conjunction with the robotic arm 4 and the grinding head 5.

[0030] Reference Figures 1-5As shown, the embodiment discloses that one side of the hollow disc 21 is fixedly connected with one side of the mechanical arm 4, the inner wall of the hollow disc 21 is symmetrically provided with a through hole 22, the outer surface of the hollow disc 21 is fixedly connected with a support 23, one side of the support 23 is fixedly connected with a motor 24, the output end of the motor 24 is fixedly connected with a round shaft 25, one end of the round shaft 25 is connected with one side of the support 23 in a penetrating manner, the inner wall of the hollow disc 21 is rotatably connected with a gear ring block 27, the inner wall of the two ends of the belt 26 is respectively sleeved on the outer surfaces of the round shaft 25 and the gear ring block 27, the inner wall of one side of the hollow disc 21 is connected with a round rod 28 in a penetrating manner, the outer surface of the round rod 28 is fixedly connected with a plurality of abutting frames 210, one side of the inner wall of the hollow disc 21 is fixedly connected with a plurality of first telescopic rods 211, one end of the first telescopic rod 211 is fixedly connected with an abutting block 212, the outer surface of the first telescopic rod 211 is sleeved with a first spring 214, the two ends of the first spring 214 are respectively fixedly connected with one side of the abutting block 212 and one side of the inner wall of the hollow disc 21, one side of the abutting block 212 is rotatably connected with a gear rod 213, one end of the gear rod 213 is connected with one side of the inner wall of the hollow disc 21 in a penetrating manner, and the outer surface of one end of the gear rod 213 is engaged with the inner wall of the gear ring block 27. When the grinding machine 1 is used for grinding processing of the tooth pressure of the gear, the grinding head 5 to be used can be installed on the gear rod 213, then according to the actual grinding condition of the gear teeth, the round rod 28 is manually rotated to drive the abutting frame 210 to rotate to a certain angle in the inner wall of the hollow disc 21 with the round rod 28 as the center, the plurality of abutting frames 210 are abutted and extruded to move downwardly to press and shrink the first telescopic rod 211 and the first spring 214, and drive the gear rod 213 and the unused grinding head 5 to move downwardly to a certain position, so that one end of the gear rod 213 is dislocated from the gear ring block 27, at this time, only the gear rod 213 on one side of the grinding head 5 to be used is engaged with the gear ring block 27, when grinding, only the motor 24 on the support 23 is started to drive the round shaft 25 to rotate, then the gear ring block 27 can be driven to rotate in the inner wall of the hollow disc 21 under the transmission of the belt 26, thereby driving the gear rod 213 and the grinding head 5 to be used to rotate, and grinding processing of the surface of the gear teeth is realized, and the same operation is also realized when the other two grinding heads 5 are used, so that the replacement operation steps are reduced, the replacement time is shortened, and the grinding processing efficiency of the gear teeth is improved. One end of the round rod 28 is provided with a limiting mechanism 29, the limiting mechanism 29 comprises a threaded rod, one end of the round rod 28 is fixedly connected with a threaded hole block 291, a plurality of threaded grooves 293 are formed in one side of the hollow disc 21, and one end of the threaded rod is spirally inserted into the inner wall of the threaded hole block 291 and the inner wall of the threaded groove 293.After the rotating round rod 28 drives the abutting frame 210 to extrude and push the abutting block 212, and the corresponding polishing head 5 is replaced, for the convenience of use, the bolt 292 can be manually screwed in the inner wall of the threaded hole block 291 and the corresponding threaded rod, and the rotating round rod 28 is limited and fixed to a certain number of turns, so that only one gear rod 213 is engaged with the tooth ring block 27, so that only one polishing head 5 can rotate to polish the gear teeth.

[0031] Referring to Figures 1-5 As shown in the figure, the embodiment discloses that the one side of the abutting frame 210 is fixedly connected with a plurality of ball bearings 215, and the plurality of ball bearings 215 are arranged at equal distances. By arranging the ball bearings 215, the contact wear between the one side of the abutting frame 210 and the one side of the ground connecting block can be reduced, the abutting and pushing operation is facilitated, and the service life of the two is improved. One end of the round rod 28 is fixedly connected with a bearing 216, and the outer ring of the bearing 216 is fixedly connected with the inner wall of the one side of the hollow disc 21. By arranging the bearing 216, one end of the round rod 28 can be limited on the inner wall of the one side of the hollow disc 21, so that the rotation of the abutting frame 210 is more stable and not easy to shake, and the rotation wear between the round rod 28 and the hollow disc 21 is reduced, and damage is avoided.

[0032] Referring to Figures 1-5 As shown in the figure, the embodiment discloses that the one end of the gear rod 213 is provided with a detachable device 3 between the outer surface and the polishing head 5, the detachable device 3 comprises a groove block 34, the one side of the groove block 34 is fixedly connected with the one side of the polishing head 5, the one end of the inner wall of the groove block 34 is symmetrically provided with a clamping hole 35, the one end of the gear rod 213 is inserted into the inner wall of the groove block 34, the outer surface of the one end of the gear rod 213 is symmetrically provided with a sliding groove 31, the inner wall of the sliding groove 31 is fixedly connected with a second spring 32, the one end of the second spring 32 is fixedly connected with a clamping block 33, the clamping block 33 is slidably connected with the sliding groove 31, and the one end of the clamping block 33 is inserted into the inner wall of the clamping hole 35. When the polishing head 5 needs to be replaced, the clamping block 33 can be manually held and slid inward in the inner wall of the sliding groove 31 to a certain position, driving the second spring 32 to contract, and then the other end is pulled out of the clamping hole 35. At this time, the groove block 34 can be pulled up and detached from the gear rod 213, so that other sizes of polishing heads 5 can be replaced, and the use adaptability of the convenient replacement device 2 is improved.

[0033] Referring to Figures 1-5As shown, the embodiment discloses that the longitudinal section of the clamping block 33 is in the shape of a U letter, and the height of one end of the clamping block 33 away from the groove block 34 is higher than that of the other end. By designing one end of the clamping block 33 to be higher than the other end, when the groove block 34 needs to be removed, the clamping block 33 can be conveniently pressed, facilitating disassembly. The inner wall of the sliding groove 31 is fixedly connected with a second telescopic rod 36, one end of the second telescopic rod 36 is fixedly connected with one side of the clamping block 33, and the outer surface of the telescopic rod is connected with the inner wall of the second spring 32. By arranging the second telescopic rod 36, the inner wall of the second spring 32 can be supported and reinforced, so that the second spring 32 is not easy to be damaged during use, and the service life is improved.

[0034] When the grinding machine 1 is used to grind the gear teeth, the gear is first placed on the clamp 7 on the grinding machine 1 for limiting and fixing, and then the grinding head 5 to be used is installed on the gear rod 213. Then, according to the actual grinding condition of the gear teeth, the circular rod 28 is rotated to a certain angle in the inner wall of the hollow disc 21 by manually holding the screw hole block 291 and passing through the bearing 216, the abutment frame 210 is rotated to a certain angle in the inner wall of the hollow disc 21 with the circular rod 28 as the center, and then the abutment frame 210 is moved downward by abutting and extruding the abutment block 212, the first telescopic rod 211 and the first spring 214 are pressed and contracted, and the gear rod 213 and the unused grinding head 5 are moved downward to a certain position, so that one end of the gear rod 213 is dislocated from the gear ring block 27. At this time, only the gear rod 213 on one side of the grinding head 5 to be used is engaged with the gear ring block 27. At this time, the bolt 292 is screwed in the inner wall of the screw hole block 291 and the corresponding threaded rod hole, and the circular rod 28 rotated to a certain number of turns is fixed. When grinding, only the motor 24 on the support 23 is started to drive the circular shaft 25 to rotate, and then the gear ring block 27 can be rotated in the inner wall of the hollow disc 21 under the transmission of the belt 26, thereby driving the gear rod 213 and the grinding head 5 to be used to rotate, so as to grind the surface of the gear teeth. Similarly, when the other two grinding heads 5 are used, the same operation is performed. In this way, the replacement operation steps are reduced, the replacement time is shortened, and the efficiency of gear tooth grinding is improved. At the same time, the rotating disc 6 on the grinding machine 1 is started to drive the clamp 7 and the clamped gear to rotate, and the grinding head 5 is used for grinding processing in cooperation with the mechanical arm 4.

[0035] When the grinding head 5 needs to be replaced, the clamping block 33 can be manually slid inward in the inner wall of the sliding groove 31 to a certain position to drive the second spring 32 to contract, and then the other end is pulled out of the clamping hole 35. At this time, the groove block 34 can be pulled upward to be disassembled from the gear rod 213, so as to facilitate the replacement of other sizes of grinding heads 5 and improve the use adaptability of the convenient replacement device 2.

Claims

1. A gear tooth grinding device comprising a grinder (1) and a plurality of grinding heads (5), characterized in that: The side of the grinding machine (1) is provided with a mechanical arm (4), the side of the grinding machine (1) is provided with a turntable (6), the side of the turntable (6) is fixedly connected with a clamp (7), the side of the mechanical arm (4) and a plurality of polishing heads (5) are provided with a convenient replacement device (2), the convenient replacement device (2) comprises a hollow disc (21) and a belt (26), the convenient replacement device (2) can install a plurality of polishing heads (5) on the same hollow disc (21) at a time, and then the corresponding size and model of the polishing head (5) can be selected and used for polishing without disassembling and reassembling, so that the gear tooth polishing efficiency is improved.

2. A gear tooth sharpening device as defined in claim 1, wherein: The side of the hollow disc (21) is fixedly connected with the side of the mechanical arm (4), the inner wall of the hollow disc (21) is symmetrically provided with a through hole (22), the outer surface of the hollow disc (21) is fixedly connected with a support (23), the side of the support (23) is fixedly connected with a motor (24), the output end of the motor (24) is fixedly connected with a circular shaft (25), one end of the circular shaft (25) is connected with the side of the support (23), the inner wall of the hollow disc (21) is rotatably connected with a gear ring block (27), the inner walls of the two ends of the belt (26) are respectively sleeved on the outer surfaces of the circular shaft (25) and the gear ring block (27), the inner wall of the hollow disc (21) is connected with a circular rod (28), the outer surface of the circular rod (28) is fixedly connected with a plurality of abutting frames (210), the inner wall of the hollow disc (21) is fixedly connected with a plurality of first telescopic rods (211), one end of the first telescopic rod (211) is fixedly connected with an abutting block (212), the outer surface of the first telescopic rod (211) is sleeved with a first spring (214), the two ends of the first spring (214) are respectively fixedly connected with the side of the abutting block (212) and the inner wall of the hollow disc (21), the side of the abutting block (212) is rotatably connected with a gear rod (213), one end of the gear rod (213) is connected with the inner wall of the hollow disc (21), and the outer surface of one end of the gear rod (213) is engaged with the inner wall of the gear ring block (27).

3. A gear tooth sharpening device as defined in claim 2 wherein: The end of the circular rod (28) is provided with a limiting mechanism (29), the limiting mechanism (29) comprises a threaded rod, the end of the circular rod (28) is fixedly connected with a threaded hole block (291), a plurality of threaded grooves (293) are formed in the side of the hollow disc (21), and the threaded rod is spirally inserted into the inner walls of the threaded hole block (291) and the threaded grooves (293).

4. A gear tooth grinding apparatus according to claim 2, wherein: The side of the abutting frame (210) is fixedly connected with a plurality of rolling balls (215), and the plurality of rolling balls (215) are arranged at equal distances.

5. A gear tooth sharpening device as defined in claim 2 wherein: The end of the circular rod (28) is fixedly connected with a bearing (216), and the outer ring of the bearing (216) is fixedly connected with the inner wall of the hollow disc (21). The end of the circular rod (28) is fixedly connected with a bearing (216), and the outer ring of the bearing (216) is fixedly connected with the inner wall of the hollow disc (21).

6. A gear tooth grinding apparatus according to claim 2, wherein: One end of the gear rod (213) is provided with a detachable device (3) between the outer surface and the polishing head (5), the detachable device (3) comprises a recess block (34), one side of the recess block (34) is fixedly connected with one side of the polishing head (5), one end of the recess block (34) is symmetrically provided with a clamping hole (35) on the inner wall, one end of the gear rod (213) is inserted into the inner wall of the recess block (34), the outer surface of one end of the gear rod (213) is symmetrically provided with a sliding groove (31), the inner wall of the sliding groove (31) is fixedly connected with a second spring (32) on one side, one end of the second spring (32) is fixedly connected with a clamping block (33), the clamping block (33) is slidably connected with the sliding groove (31), one end of the clamping block (33) is inserted into the inner wall of the clamping hole (35).

7. A gear tooth grinding apparatus according to claim 6, wherein: The longitudinal section of the clamping block (33) is in U shape, the height of one end of the clamping block (33) away from the recess block (34) is higher than the height of the other end.

8. A gear tooth grinding apparatus according to claim 6, wherein: The inner wall of the sliding groove (31) is fixedly connected with a second telescopic rod (36) on one side, one end of the second telescopic rod (36) is fixedly connected with one side of the clamping block (33), the outer surface of the telescopic rod is sleeved with the inner wall of the second spring (32).

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